[original] PLSQL index sorting optimization

Reprint please indicate the source

select /*+INDEX_DESC(T IDX_SYS_MESS_CREATE_DATE)*/
*
FROM sys_message T
where t.create_date is not null

 

 

Index name ：IDX_SYS_MESS_CREATE_DATE

SQL Table alias ：T

Be careful ：1、 /*+INDEX_DESC(T IDX_SYS_MESS_CREATE_DATE)*/   The alias of the red word should be the same as that of the table

           2、 We must add where Index field  is not null 

           3、 Data sets （ Non table ） No index available

           4、 /*+INDEX_DESC(T IDX_SYS_MESS_CREATE_DATE)*/   After adding this sentence, it will be automatically sorted according to the red ink keyword , There is no need to add order by , The scarlet letter can also be changed to ASC  

Press F5 Under execution , If the following keywords appear, it means success